Cylinder



FIG. 1 is a top plan view of a cylinder, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back plan view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a perspective view thereof.

The ornamental design for a cylinder, as shown.